Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3: Relationship to colossal magnetoresistance

J. Tao; D. Niebieskikwiat; M. Varela; W. Luo; M. A. Schofield; Y. Zhu; M. B. Salamon; J. M. Zuo; S. T. Pantelides; S. J. Pennycook

doi:10.1103/PhysRevLett.103.097202

Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3: Relationship to colossal magnetoresistance

J. Tao^*
, D. Niebieskikwiat
, M. Varela
, W. Luo
, M. A. Schofield
, Y. Zhu
, M. B. Salamon
, J. M. Zuo
, S. T. Pantelides
, S. J. Pennycook

^*Corresponding author for this work

Oak Ridge National Laboratory
Brookhaven National Laboratory
University of Illinois at Urbana-Champaign
Vanderbilt University
University of Texas at Dallas

Research output: Contribution to journal › Article › peer-review

124 Scopus citations

Abstract

A nanoscale phase is known to coincide with colossal magnetoresistance (CMR) in manganites, but its volume fraction is believed to be too small to affect CMR. Here we provide scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in La1-xCaxMnO3, x=0.45. They are not doping inhomogeneities, and their structure is that of the bulk compound at x=0.60, which at low temperatures is insulating. Their volume fraction peaks at the CMR critical temperature and is estimated to be 22% at finite magnetic fields. In view of the known dependence of the nanoscale phase on magnetic fields, such a volume fraction can make a significant contribution to the CMR peak.

Original language	English
Article number	097202
Journal	Physical Review Letters
Volume	103
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.103.097202
State	Published - 27 Aug 2009

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10.1103/PhysRevLett.103.097202

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title = "Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3: Relationship to colossal magnetoresistance",

abstract = "A nanoscale phase is known to coincide with colossal magnetoresistance (CMR) in manganites, but its volume fraction is believed to be too small to affect CMR. Here we provide scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in La1-xCaxMnO3, x=0.45. They are not doping inhomogeneities, and their structure is that of the bulk compound at x=0.60, which at low temperatures is insulating. Their volume fraction peaks at the CMR critical temperature and is estimated to be 22\% at finite magnetic fields. In view of the known dependence of the nanoscale phase on magnetic fields, such a volume fraction can make a significant contribution to the CMR peak.",

author = "J. Tao and D. Niebieskikwiat and M. Varela and W. Luo and Schofield, \{M. A.\} and Y. Zhu and Salamon, \{M. B.\} and Zuo, \{J. M.\} and Pantelides, \{S. T.\} and Pennycook, \{S. J.\}",

year = "2009",

month = aug,

day = "27",

doi = "10.1103/PhysRevLett.103.097202",

language = "Ingl{\'e}s",

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journal = "Physical Review Letters",

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TY - JOUR

T1 - Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3

T2 - Relationship to colossal magnetoresistance

AU - Tao, J.

AU - Niebieskikwiat, D.

AU - Varela, M.

AU - Luo, W.

AU - Schofield, M. A.

AU - Zhu, Y.

AU - Salamon, M. B.

AU - Zuo, J. M.

AU - Pantelides, S. T.

AU - Pennycook, S. J.

PY - 2009/8/27

Y1 - 2009/8/27

N2 - A nanoscale phase is known to coincide with colossal magnetoresistance (CMR) in manganites, but its volume fraction is believed to be too small to affect CMR. Here we provide scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in La1-xCaxMnO3, x=0.45. They are not doping inhomogeneities, and their structure is that of the bulk compound at x=0.60, which at low temperatures is insulating. Their volume fraction peaks at the CMR critical temperature and is estimated to be 22% at finite magnetic fields. In view of the known dependence of the nanoscale phase on magnetic fields, such a volume fraction can make a significant contribution to the CMR peak.

AB - A nanoscale phase is known to coincide with colossal magnetoresistance (CMR) in manganites, but its volume fraction is believed to be too small to affect CMR. Here we provide scanning-electron-nanodiffraction images of nanoclusters as they form and evolve with temperature in La1-xCaxMnO3, x=0.45. They are not doping inhomogeneities, and their structure is that of the bulk compound at x=0.60, which at low temperatures is insulating. Their volume fraction peaks at the CMR critical temperature and is estimated to be 22% at finite magnetic fields. In view of the known dependence of the nanoscale phase on magnetic fields, such a volume fraction can make a significant contribution to the CMR peak.

UR - https://www.scopus.com/pages/publications/69449085071

U2 - 10.1103/PhysRevLett.103.097202

DO - 10.1103/PhysRevLett.103.097202

M3 - Artículo

AN - SCOPUS:69449085071

SN - 0031-9007

VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 097202

ER -

Direct imaging of nanoscale phase separation in La0.55Ca0.45MnO3: Relationship to colossal magnetoresistance

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